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―Dooku, mistaking the assailants to be Jedi before attacking them[src]

The Nightsisters believe they have Dooku at their mercy

Asajj Ventress and her two Nightsisters became invisible and infiltrated Tyranus's palace. Ventress shot a poison dart into Tyranus's neck that blinded him, although he could still sense them through the Force and mistook them as Jedi. Ventress attacked Dooku with a lightsaber, beginning their duel in the Count's bedroom and eventually leading into his office. Ventress, who had managed to stay disguised during the entire confrontation, managed to disarm the Sith Lord and was about to strike the killing blow, but Tyranus defended himself by striking Ventress and her accomplices with Force lightning, throwing them out the window and over a cliff, ending the attack. However, the three Nightsisters survived and returned to Dathomir.

Due to his attackers' use of Jedi lightsabers, Tyranus mistakenly believed that the Jedi had tried to assassinate him. Wishing to protect himself, he sought a new apprentice to replace Ventress (whom he erroneously believed to be dead).

Given the failure of their direct attempt to kill Tyranus, the Nightsisters developed a new plot to kill the Sith Lord using a double agent. To arrange the plan, MotherTalzin contacted Tyranus, offering to provide one of the Nightbrothers to be his new assassin. Tyranus, seeing this as an opportunity to get the new apprentice he desired, agreed. After selecting Savage Opress to be their pawn, Talzin presented the hulking Zabrak to Tyranus, who was pleased with his new warrior, unaware of his true loyalties.